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It has long been thought that the Germans were unable to forecast the weather on D-Day, June 6, 1944, because they had very few observations over the Atlantic, and these were critical for predicting European weather. The U-boats were being defeated, and only three German submarines were sending reports from the Atlantic by June 1944. Recently discovered archive material has, however, revealed surprisingly detailed German maps of Atlantic weather systems. The Swedish meteorologist Anders Persson uncovered the German charts. “Previous accounts seem to have overlooked the surprisingly high quality of the analyses made by German meteorologists,” said Dr Persson. How